Spring-balance scale.



No. 804,885. PATENTBD riovI 21, 1905. w. H. SANDERSON.

SPRING BALANCE SCALE.

APPLIGATION PILED DEU.13. 1903.

flwzm A4 JM W QQZ%Z UNITED STATES PATENT OFFICE.

WILLIAM H. SANDERSON, OF DAYTON, OHIO, ASSIGNOR TO THE COM- PUTING SCALECOMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO.

SPRING-BALANCE SCALE.

No. 804,885. Specification of Letters Patent. Patented Nov. 21, 1 905.

Application filed December 18. 1903. Serial No. 185.744.

I trally of a rod 0 to the ends of which the rods 0 are connected. Aconnection is shown for communicating the weight efieet of the object tobe weighed upon the springs to the weight-indicating drum or dial a,this connection consisting in the present instance of a rack and pinionD, operated by a rod (Z at each end of the drum and adapted to beconnected with the load-support by atransverse rod (Z.

Upon the under side of frame B levers E are fUlCIUI'IlGCi, preferablybetween lugs e, springs C being connected to the outer and preferablylonger arms of the levers at a. It will thus be of being suspended froma rigid part of the frame is carried by levers E. The other arms of thelevers E approach near to each other and terminate in rounded ends orknobs 5, adapted for engagement with the tare-adjusting device F. Thefulcrums a may be at any desired point along the length of levers E, butare preferably placed as shown to produce a multiplication of two.

The tare-adjusting device F, as shown in Fig. 1, consists of a pistonf,mounted in a suitable housing f upon frame B and bearing upon knobs a oflevers E. The adjustment is offected by a screw f working within thehousing and having a central extension or boss f at its lower endconically pointed orotherwise suitably formed for engagement with aconcaved bearing in piston f. At its upper or outer end screw f isenlarged and formed f", and below the knob To all whom it may concern.-

Be it known that I, VVILLIAM H. SAND ERSON, a citizen of the UnitedStates, residing at Dayton, in the county of Montgomery and State ofOhio, have invented certain new and useful Improvements inSpring-Balance Scales; and I do hereby declare the following to be afull, clear, and exact description of the same, reference being had tothe accompanying drawings, forming a part of this specification, and tothe letters of reference marked thereon.

This invention relates to scales in which a spring or system of springsis used to measure weight; and it has for its object the provision ofmeans, in combination with such a balance, whereby the net weight of theobject or material upon the scales may be read directly upon theindicating dial or drum, there-- by avoiding the necessity ofsubtracting the tare from the gross weight shown by the dial, asheretofore.

In practicing my invention I provide springbalance scales, which may beof any wellknown or hereafter-tobe-devised construction, with means forchanging the effective action of the spring or system of springs uponthe indicating-dial in order to adjust the reading in such a manner asto show the net. weight-that is, the dial shows direct the true weightof the object, the tare being eliminated.

The invention consists of the combination of parts and details ofconstruction of springbalance scales hereinafter described and claimed,and shown in the accompanying drawings, in whieh Figure 1 is a view,partly in section, of a spring-balance furnished with my improvements,the load-support, which may be of any well-known construction, beingomitted; and Fig. 2 is a detail showing amodification of thetare-adjusting mechanism and its indicatingdial.

Referring to the drawings, A is the casing of a spring-scale of thattype now known as the Boston scale and to which type the invention ismore especially applicable, such casing having an opening for exposingthe weight or value indications on a drum or dial a, journaled in thecasing. A frame B supports the counterbalancesprings C of the scales,these springs having means, such as' rods 0, for connection to aload-support, which may be a pan or platform, but is shown as a hook ordraft-rod connection 0, located ceninto a knurled knob is a scale orseries of tare-graduations f, adapted to register with a fixedindex-mark f. The index-mark f is shown as placed upon a fixed ringf'mounted upon the frame B and telescoping with the graduated flange f toentirely inclose the upper part of device F; but any other form ofindex-mark or pointer may be used.

In the modification shown in Fig. 2 piston f is acted upon by cam fworking within a bearing on the-piston on a pivot f" and controlled byan operating-arm f Thearm f carries a pointer f traveling over anindexscale f It will be seen that by the tare-adjusting device the innerarms of levers E are depressed or elevated, there by producing a reverseeffect upon the outer arms of said levers to raise or lower the springswith their connections, and

seen that the load-support insteadthis adjustment will be indicated uponthe dial 7,- (or f in Fig. 2,) both of which are shown graduated toindicate tare in pounds and ounces and in amount up to five pounds. Bythis arrangement the receptacle in which the material is to be weighedmay be placed upon the weight-support and weight-indicating dial broughtto zero by manipulation of the tare-adjusting device. Theindicating-drum will then show directly the net weight or price of thematerial placed in the receptacle, and the dial of the tare-adjustingdevice will show the tare in pounds and ounces.

Vvhile I have illustrated and described my invention as applied to onetype of springbalance scales, it will be understood that it isapplicable to many other types and forms. Also many changes may be madein the form and details of construction of the device shown withoutdeparting from the scope of the invention, although it will beunderstood that the invention is especially applicable to price andweighing scales where there is a drum on which the indications aremarked and in connection with which the springs are widely separated orlocated at the ends of the drum.

The indicator for indicating the amount of tare, it will be noted, isgraduated in pounds and ounces. Thus the user may readily set the scaleto weigh off the desired tare for ves sels of uniform weight or to weighoil a known proportion of material for which a price is not to becharged. In constructing this part of the apparatus it will be notedthat the tare-indicator has been made relatively large. and even withthe screw adjustment a single turn of the indicator will suffice toindicate several pounds.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In scales, the combination ofa'frame, suspension-levers pivoted tosaid frame, counterbalance-springs connected with said levers, aload-support connected with said springs, an indicator, aconnection forcommunicating the weight effect upon said springs to said indicator, apiston working in said frame and bearing upon said levers, and anadjustable pressure device operative upon said piston.

2. In scales, the combination of a system of pivoted suspension levers,counterbalancesprings connected to corresponding arms of 1 said levers,a load-support connected with said springs, a weight-indicator, aconnection for communicating the weight effect upon said springs to saidweight-indicator, and an adjusting device operative upon the other armsof said levers.

3. In scales, connterbalance-spring mechanism, a tare-adjusting devicein operative relation thereto and comprising a housing, a piston mountedin said housing, a screw-th read device operative upon said piston, adial to indicate the amount of said tare adjustment, and connectionsintermediate the piston and counterbalance-spring mechanism forcommunicating the tare adjustment to the latter.

at. In scales, the combination with an indicating-drum, a goods-supportand counterbalancing-springs at opposite ends of the drum of means foradjustably supporting said springs at their upper ends, means forsimultaneously adjusting said supporting means and an indicator forindicating the adjustment; substantially as described.

5. In scales, the combination with an indicating-drum, a goods-su pport, connections for rotating the drum by the movement of thegoods-support and counterbalancing-springs at opposite ends of the drum,of adjustable supports for the upper ends of the springs and a centraladjusting device for said supports; substantially as described.

6. A spring-scale having two distensible spiral springs which supportthe load, two like spring-levers, one arm of each being coupled to theupper end of its spring, a tareadjusting screw, and means between saidscrew and the arms of the spring-levers for simultaneously and uniformlylifting both springs to regulate the tare.

'7. A spring-scale having a draw-bar from which the load is suspended, across-head on said bar, two like distensible upright springs coupledbelow to said cross-head, two springlevers, one arm of each of which iscoupled to the upper end of said springs and means for rocking orturning said spring-levers simultaneously about their respectivefulcrums for raising and lowering the springs, said means embodying ascrew for regulating tare.

WILLIAM H. SANDERSON.

IVitnesses:

E. A. SMITH, Geo. SonwARz.

